Chevy is 15 weeks old and likes to bite us. He is not aggressive with other dogs or other people and is not food aggressive. He bites all four of us and I'm at a loss what to do. We try to redirect him with a toy, telling him "enough" or "no" quite loudly, and walking away and he still jumps and bites. We've even tried the (The Dog Whisperer Cesar Millan) "bite" with your hand gently (and firmly) and that just seems to tick him off. If he can't get at our hands or arms, he goes for the legs and has ripped holes in our clothing . I am so frustrated with this behavior. After getting really wound up with biting and barking, I put him in his crate for a bit, like a time out, until he settles down and then he is let out where he'll be fine for awhile but then it starts all over again. We start puppy kindergarten in a couple weeks but I don't know if that is something they address or not. He's got tons of toys, gets walked twice a day, gets training time and we're always trying to play with him so it's not like he is lacking in the attention department. It just seems when we try to play, he starts getting aggressive after a little while. Any help is very much appreciated!